package com.mc.linkerlist;

import com.mc.linkerlist.HNode;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Test {

    String openToken = "${";
    String closeToken = "}";

    public static void main(String[] args) {
        Test test = new Test();
        String str = "${userName}${password}${age}";
        System.out.println(test.parse(str));
        System.out.println((int)'\\');
    }


    public String parse(String text) {
        if (text == null || text.isEmpty()) {
            return "";
        }
        // search open token
        int start = text.indexOf(openToken);
        if (start == -1) {
            return text;
        }
        char[] src = text.toCharArray();
        int offset = 0;
        final StringBuilder builder = new StringBuilder();
        StringBuilder expression = null;
        do {
            if (start > 0 && src[start - 1] == '\\') {
                // this open token is escaped. remove the backslash and continue.
                builder.append(src, offset, start - offset - 1).append(openToken);
                offset = start + openToken.length();
            } else {
                // found open token. let's search close token.
                if (expression == null) {
                    expression = new StringBuilder();
                } else {
                    expression.setLength(0);
                }
                builder.append(src, offset, start - offset);
                offset = start + openToken.length();
                int end = text.indexOf(closeToken, offset);
                while (end > -1) {
                    if (end > offset && src[end - 1] == '\\') {
                        // this close token is escaped. remove the backslash and continue.
                        expression.append(src, offset, end - offset - 1).append(closeToken);
                        offset = end + closeToken.length();
                        end = text.indexOf(closeToken, offset);
                    } else {
                        expression.append(src, offset, end - offset);
                        break;
                    }
                }
                if (end == -1) {
                    // close token was not found.
                    builder.append(src, start, src.length - start);
                    offset = src.length;
                } else {
//                    builder.append(handler.handleToken(expression.toString()));
                    offset = end + closeToken.length();
                }
            }
            start = text.indexOf(openToken, offset);
        } while (start > -1);
        if (offset < src.length) {
            builder.append(src, offset, src.length - offset);
        }
        return builder.toString();
    }


//    public String handleToken(String content) {
//        Object parameter = context.getBindings().get("_parameter");
//        if (parameter == null) {
//            context.getBindings().put("value", null);
//        } else if (SimpleTypeRegistry.isSimpleType(parameter.getClass())) {
//            context.getBindings().put("value", parameter);
//        }
//        Object value = OgnlCache.getValue(content, context.getBindings());
//        String srtValue = value == null ? "" : String.valueOf(value); // issue #274 return "" instead of "null"
//        checkInjection(srtValue);
//        return srtValue;
//    }


}

